Resistance unit.



L. P. HYNVES. RESISTANCE UNITYI APPLICAIION HLED 11m11.191s.

. Patented Mar. 18,1919.

UNITED eiseres reirse/fr cerro.

LEE I?. HYNES, 0F CHXCAGO, ILLINOIS, ASSIGNOR TO THERXVIO ELECTRICREGULATOR CD., 0F CHICAGO, ILLINOIS, .[*1 COROILTON 0F LLNOS.

RESISTANCE UNIT.

Specification of Letters Patent. Patntd Bleil'. 1S, 1919.

Application filed May 7, 1915. Serial No. 26,482.

To all 'whom t may concern:

Be it known that l., Les P. HYNns, a citizen of the United States 'ofAmerica, und

resident of Chica-go, Cook county, lllinois, present res. add., 7320Princeton ave., have invented a certain new and useful Improvement inResistance Units, of which the following is a specification.

My invention relates to resistance for use in electrical circuits, andmore particularly to devices of this kind which are designed to beemployed in exposed positions, as in making` uncovered connections forcircuits employing heavy and dangerous currents, and which must,therefore, be suitably protected Vor covered.

Generally stated, the object of my invention is to provide acomparatively simple and inexpensive resistance unit of the foregoinggeneral character7 and to provide a device of this kind which will besatisfactory and reliable in use, es Well as suie to employ in exposedplaces.-

A special object is to provide an improved construction and arrangementwhereby e resistance unit. of this general character may be produced ata comparatively small cost o manufacture.

It is also en object to provide certain de tails and features ofconstruction tending to' increase the general eliioiency end desiro-'oility of e resistance device ofthis particular character, not onlyfrom the standpoint of actual use, but also with regard to theseltisfactory and low cost of production thereof. l l

To these und other useful ends my invention consists in mattershereinafter set forth and claimed.

ln the accompanying drawings-- Figure l is a longitudinal section or aresistance unit embodying the principles of my invention.

Fig. 2 is an end view of the device shown in Fig. 1.

Fig. 3 is a. cross Fig. l.

As thus illustrated, my invention comprises e. tube A of porcelain orsimilar insulating material, having; opposite ends c of any suitableshape. Wound on seid tube and thencoated with enamel C or other similarheat resisting und insulating material; This holds the coil firmlyill-place. For exemple, the tube A -aguinst outward displacement.

- preventing the section'on line 3-3 iu yThe resistance coil B is 'canbe of hard baked or fired clay or pottery,

and may have the enamel C baked and vitrified thereon by any well knownmethod. Thus the coil li is suitably insulated and embedded in thevitreous enamel coatin of the tube. Heads D of insulating and lectresisting material are provided with cylindrie recesses'zi to receivethe ends of said asbestos preparations, or other simile-r sub-f' lstances, commonly used in the manufacture of electrical articles. vlperforated sheet metal cylinder F is erranged to inciose the resistancecoil and extend over seid 'heads l), the end edges of said cylinder.being bent inward to form tlangesj which hold the heads Suid cylinder Fis preferably formed from sheet metal and has a lap join-t G along oneside thereof. The terminals b of the coil extend `around end into theends of the tube A, washers H of asbestos wicking being interposedbetween the ends of said tube sind the heads. Conductors l of strandWire are covered. with asbestos insulation z' and arranged to extendthrough `'the soles -ll und into said tube. Knots .i ere formed in theseflexible conductors immediately inside the washers with the-ends oi?.seid conductors inside of said knots. "lhus the pull is on the knots J,

when the device is connected up or used, endifv not on the terminals ofthe coil'.

lt desired, cage F mcy have interior bedeif extending V immediatelyinside of the 'bends D, thus ward.

circumferentislly thereof letter from being pushed in' The seid cogeconstitutes. thesole means for holding'said heads D in .place onv theends of theresistancc tube, end the-Xy washers H serve to cushion and'protect thefends et seid tube against breakage. :"lIn this way the`heelds D erenot conueoted'by any. thing extending through the tube'A,and thus (longer of short circuitingisy greatly reduced. y

For the broader purposes of'rny invention any suitable resistentie `mcybeinelosed withn in the cage F end held in place by said heads. But, the`form .of resistance coil shown and described. is suitable for thepurpoee, and in euch ease the initie and bi-eakabile "tube A iepireerabiy cushioned in the head@ te prevent breakage dwing manu- 'eeuieand afterward as Weil( Also, the

heads D and cage .F may beef any suitable or desired shape. v

Ae shown, ehe Wagners H are eup-eha-ped to eieetnaiiy -surieund the endeof lhe frangible lib-e A 'and hei'eby prevenibreakage when the device iesubjected ie shock or jar. The Washers can'be molded or made in this`shape, er they een be made ia, and soft and allowed te dew ein: at eheh:edges when he two heads D are-brought toward each other. .But theseWashers aan he of `any suitable shape and ehazeeeir. y

I de not limit myself ie the exact, eenn Structien shown and dei'ibed.-

That I'. claim as my invenion isz- 1. A. neeietanee unit .comprising ai'esist-` ance element, insixlaeing heads for the pposite ends ef dieresistance element, c0nneetiens extending through said heads te thereeieienee, and m'amineus cage having,f ineens te heid seid heads inpiace, said cage heim; `specie/d.' from said, element, said ee -n'iensVcomprising a breakable tube, and

` Ine-ansie? cushioning the ende of said tube Iin he heads, said cagepreventing beth inward end outward dispiaeemeniA ef Said meiste-nee unit,ieempiising a tubular resistance element, heads for the resistanceelement, means to connect said heads, and means to cushion the ends ofsaid element in said heads, saidcushioning means; comprising cup-shapedWashers onv the ende of said element, said heads being cup-shaped. teheid said washes, and conductors exw tending through said Washersy andconnected with adjacent ends of said element.

3. A resistance unit comprisingeppeeitely arranged cup-*shaped heads ofinsulation, a tubuiai' insistance-dement having' its ends dispoeedineaid eup-shaped heads, said e1enient involving an enter coil and aninner tube o heat-:resisting insulation, said heads having n'ieans tecushion the ends of said tube therein, insulated conductors extend ingvceiim'aiiy through said heads and into the ends of said tube, eachconductor being connected with. the adjacent end of said coil, and aeylindrie cage having openings in the sides thereof and provided withend p0rtions which extend beyond said heads, these end poiions of theCage having integral means to hold the heads against. Ioothtilvl 'wardand 'outward dispacement, and to render removal of said heads impossibleexcept by forcibly bendingr the metal of the cage ai. the extreme endsthereof.

Signed by me at, Chicago, I11in0is,fths 24th `day of April, 195. v

' .LEE P.' HYNE'S.

